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Commit 5db2ee57 authored by Talel Atias's avatar Talel Atias
Browse files

msm: kernel: rndis_ipa: data path packet dump 



This commit add the ability to dump to console
data path packet.
The dump is configurable by using debugfs entries.
User can choose to dump transmitted packet or
received packets (or both).
The default is to disable both.
The debugfs entries are called tx_dump_enable and
rx_dump_enable and can be found under <debugfs>/rndis_ipa/

Change-Id: I67009b011e0fdb0aef45030d9e17dcc7008bdc2c
Signed-off-by: default avatarTalel Atias <tatias@codeaurora.org>
parent cadcc68d

drivers/net/ethernet/msm/rndis_ipa.c

+50 −0
Original line number Diff line number Diff line
@@ -154,8 +154,10 @@ struct rndis_loopback_pipe { 
 * @directory: debugfs directory for various debugging switches

 * @tx_filter: flag that enable/disable Tx path to continue to IPA

 * @tx_dropped: number of filtered out Tx packets

 * @tx_dump_enable: dump all Tx packets

 * @rx_filter: flag that enable/disable Rx path to continue to IPA

 * @rx_dropped: number of filtered out Rx packets

 * @rx_dump_enable: dump all Rx packets

 * @icmp_filter: allow all ICMP packet to pass through the filters

 * @rm_enable: flag that enable/disable Resource manager request prior to Tx

 * @loopback_enable:  flag that enable/disable USB stub loopback
@@ -180,8 +182,10 @@ struct rndis_ipa_dev { 
	struct net_device *net;

	u32 tx_filter;

	u32 tx_dropped;

	u32 tx_dump_enable;

	u32 rx_filter;

	u32 rx_dropped;

	u32 rx_dump_enable;

	u32 icmp_filter;

	u32 rm_enable;

	bool loopback_enable;
@@ -270,6 +274,7 @@ static ssize_t rndis_ipa_debugfs_loopback_read(struct file *file, 
		char __user *ubuf, size_t count, loff_t *ppos);

static ssize_t rndis_ipa_debugfs_atomic_read(struct file *file,

		char __user *ubuf, size_t count, loff_t *ppos);

static void rndis_ipa_dump_skb(struct sk_buff *skb);

static int rndis_ipa_debugfs_init(struct rndis_ipa_dev *rndis_ipa_ctx);

static void rndis_ipa_debugfs_destroy(struct rndis_ipa_dev *rndis_ipa_ctx);

static int rndis_ipa_ep_registers_cfg(u32 usb_to_ipa_hdl,
@@ -473,6 +478,8 @@ int rndis_ipa_init(struct ipa_usb_init_params *params) 
	rndis_ipa_ctx->rm_enable = true;

	rndis_ipa_ctx->tx_dropped = 0;

	rndis_ipa_ctx->rx_dropped = 0;

	rndis_ipa_ctx->tx_dump_enable = false;

	rndis_ipa_ctx->rx_dump_enable = false;

	rndis_ipa_ctx->outstanding_high = DEFAULT_OUTSTANDING_HIGH;

	rndis_ipa_ctx->outstanding_low = DEFAULT_OUTSTANDING_LOW;

	atomic_set(&rndis_ipa_ctx->outstanding_pkts, 0);
@@ -747,6 +754,9 @@ static netdev_tx_t rndis_ipa_start_xmit(struct sk_buff *skb, 
		goto out;

	}



	if (unlikely(rndis_ipa_ctx->tx_dump_enable))

		rndis_ipa_dump_skb(skb);



	if (unlikely(rndis_ipa_ctx->state != RNDIS_IPA_CONNECTED_AND_UP)) {

		RNDIS_IPA_ERROR("Missing pipe connected and/or iface up\n");

		return -NETDEV_TX_BUSY;
@@ -820,6 +830,9 @@ static void rndis_ipa_tx_complete_notify(void *private, 


	NULL_CHECK_NO_RETVAL(private);



	RNDIS_IPA_DEBUG("packet Tx-complete, len=%d, skb->protocol=%d",

		skb->len, skb->protocol);



	if (unlikely((evt != IPA_WRITE_DONE))) {

		RNDIS_IPA_ERROR("unsupported event on TX call-back\n");

		return;
@@ -929,6 +942,9 @@ static void rndis_ipa_packet_receive_notify(void *private, 
	RNDIS_IPA_DEBUG("packet Rx, len=%d",

		skb->len);



	if (unlikely(rndis_ipa_ctx->rx_dump_enable))

		rndis_ipa_dump_skb(skb);



	if (unlikely(rndis_ipa_ctx->state != RNDIS_IPA_CONNECTED_AND_UP)) {

		RNDIS_IPA_DEBUG("use connect()/up() before receive()\n");

		RNDIS_IPA_DEBUG("packet dropped (length=%d)\n",
@@ -1752,6 +1768,24 @@ static const char *rndis_ipa_state_string(enum rndis_ipa_state state) 
	}

}



static void rndis_ipa_dump_skb(struct sk_buff *skb)

{

	int i;

	u32 *cur = (u32 *)skb->data;

	u8 *byte;



	RNDIS_IPA_DEBUG("packet dump start for skb->len=%d\n",

		skb->len);



	for (i = 0; i < (skb->len/4); i++) {

		byte = (u8 *)(cur + i);

		pr_info("%2d %08x   %02x %02x %02x %02x\n",

			i, *(cur + i),

			byte[0], byte[1], byte[2], byte[3]);

	}

	RNDIS_IPA_DEBUG("packet dump ended for skb->len=%d\n",

		skb->len);

}



/**

 * Creates the root folder for the driver
@@ -1909,6 +1943,22 @@ static int rndis_ipa_debugfs_init(struct rndis_ipa_dev *rndis_ipa_ctx) 
		goto fail_file;

	}



	file = debugfs_create_bool("tx_dump_enable", flags_read_write,

			rndis_ipa_ctx->directory,

			&rndis_ipa_ctx->tx_dump_enable);

	if (!file) {

		RNDIS_IPA_ERROR("fail to create tx_dump_enable file\n");

		goto fail_file;

	}



	file = debugfs_create_bool("rx_dump_enable", flags_read_write,

			rndis_ipa_ctx->directory,

			&rndis_ipa_ctx->rx_dump_enable);

	if (!file) {

		RNDIS_IPA_ERROR("fail to create rx_dump_enable file\n");

		goto fail_file;

	}



	RNDIS_IPA_LOG_EXIT();



	return 0;